SDR ASAA2025082060624

Service difficulty report · Floorbeam · Boeing 737990ER

Difficulty date: August 20, 2025
Submitted: September 9, 2025
Operation: Air carrier
Aircraft: N448AS
Make and model: Boeing 737990ER
Aircraft serial: 36356
Aircraft time: 34,132 hours, 10,528 cycles
System (JASC): 5315 · Fuselage Main, Floor Beam
Part: Floorbeam
Part number: 141A54108
Condition: Corroded
Location: Zone 200
Stage of operation: IN
How discovered: V
Nature of condition: O
Precautionary procedure: K

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

CABIN FWD FLOOR WET AREA APPROX.STA.297 RBL 12, FLOORBEAM UPPER SURFACE CORRODED AROUND FASTENER HOLE (1EA). GROUNDED - YES. REMOVED CORROSION, ORIG THICK .080", REMOVED .033", REMAINING .047" FOUND OUT OF LIMITS IAW SRM 53-10-51, REMOVED AND REPLACED PANEL BREAK IAW SRM 51-40-02 AND DWG 141A5400 REV:-.